CPU 100% - STP?

Unanswered Question
Dec 9th, 2008
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Hi, we are have strange problem with sup720-base:

In different time CPU utilization equal ~99-100%

and we have out for service (we haven't ping to the switch!)

I start stp debug all, and when cpu grow to 100% I recieve these messages:

Dec 10 08:38:54: SPANTREETYPE: getting tree type vlan for parameter 1 value 1

Dec 10 08:38:54: stp: begin nvgen vlan 999 config blocks

Dec 10 08:38:54: stp: nvgen state 0 config blocks

Dec 10 08:38:54: stp: nvgen protocol 0 config blocks

Dec 10 08:38:54: stp: nvgen priority 999 config blocks

Dec 10 08:38:54: stp: nvgen hello 0 config blocks

Dec 10 08:38:54: stp: nvgen fwddelay 0 config blocks

Dec 10 08:38:54:et1/3 (462FA4B8)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/3 1=2 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/3 (462FA4B8) stp: n

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/3 1=3 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/3 (462FA4B8)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/3 1=1 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/3 (462FA4B8)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/3 12=1 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/3 (462FA4B8)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/3 11=1 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/3 (462FA4B8)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/3 9=1 rc=1vgen maxage 0 config blocks

Dec 10 08:38:55: STP CFG: found (462FA4B8)

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/3 (462FA4B8)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/3 4=3 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/3 (462FA4B8)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/3 3=3 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/4 (462FBA20)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/4 1=2 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/4 (462FBA20)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/4 1=3 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/4 (462FBA20)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/4 1=1 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/4 (462FBA20)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/4 12=1 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/4 (462FBA20)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/4 11=1 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/4 (462FBA20)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/4 9=1 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/4 (462FBA20)

Dec 10 08:38:55: STP CFG: get port param mst 0 GigabitEthernet1/4 10=1 rc=1

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/4 (462FBA20)

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/4 (462FBA20)

Dec 10 08:38:55: STP CFG: get port param unknown 0 GigabitEthernet1/4 7=1 rc=0

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/4 (462FBA20)

Dec 10 08:38:55: STP CFG: found port cfg GigabitEthernet1/4 (462FBA20)

and more...


maybe somewho know what is it and how it can be fixed?

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viyuan700 Tue, 12/09/2008 - 20:52
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Is GigabitEthernet interface 1/3 and 1/4 are providing redundancy? Looks like in loop. Is it possible to take out one and see if that break the loop.

rush2amol Tue, 12/09/2008 - 22:16
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go for show cdp nei command, if you see the same switch then its a loop between ports on the same switch.


does the 100% cpu is reached after you issue debug all command, for information the debug all command is very process intensive.


silver_wolf Tue, 12/09/2008 - 23:40
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cdp don't display same switch.

about debug - we enable only spanning-tree debug.

viyuan700 Wed, 12/10/2008 - 00:09
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did u try

show processes cpu i think it tells u which process is utilizing that much CPU. Maybe that can help you to crack the problem.

Giuseppe Larosa Wed, 12/10/2008 - 00:17
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Hello Aleksey,

I lost a C4506 switch just doing debug stp packets so it is quite heavy for the switch.


You say the two ports are disabled are also unplugged ?


Hope to help

Giuseppe


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